Funding for this research was provided by:
Health Promotion Administration, Ministry of Health and Welfare (700/1480)
Received: 22 December 2017
Accepted: 31 July 2019
First Online: 7 August 2019
Ethics approval and consent to participate
: The East Azerbaijan Population Based Cancer Registry (EAPBCR) provided the data of this study. The ethics committee of Tabriz University of Medical Sciences has been approved this project, and all patients information and records are confidential (Grant Number: IR.TBZMED.REC.1395.1333). We followed ethics rules of EAPBCR for manuscript publication.
: Not applicable.
: The authors declare that they have no competing interests.